Rotary Armature Core Shoe Coupling via Arc Cutout
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Solution Overview
Problem
The existing armature core designs face challenges with misaligned lamination and slant lamination of laminated steel sheets, leading to issues with pin insertion and breakage, which complicates the rotation of shoe parts and degrades productivity and workability in inserting armature coils.
Innovation Solution
The armature core features magnetic pole teeth with arc-shaped cutouts and separate shoe parts with circular portions, allowing rotational movement along the circumference, eliminating the need for a pin and enhancing assembly by using the arc-shaped cutout and circular portion as a guide for rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pin is used to couple the magnetic pole tooth and shoe part together to enable rotation, then the shoe part can be rotated to increase slot opening width, but the pin is prone to break or bend due to small diameter and misaligned lamination
Solution Approach 1:
The invention extracts and eliminates the pin component from the coupling mechanism. Instead of using a separate pin to connect the magnetic pole tooth and shoe part, the patent uses a groove formed directly in the magnetic pole tooth that receives the protruding portion of the shoe part, thereby removing the pin and its associated reliability issues while maintaining the rotational functionality
Solution Approach 2:
The invention merges the coupling function into the magnetic pole tooth structure itself by forming a groove directly in the tooth. This integrates the previously separate pin component into the existing structure, eliminating the need for additional parts and simplifying the assembly while maintaining the rotational capability of the shoe part
2Stability of the object's composition
If the number of laminated steel sheets is increased, then the armature core structure is more complete, but misaligned lamination or slant lamination occurs making pin insertion difficult
Solution Approach 1:
By removing the pin component entirely and replacing it with a groove-based coupling mechanism, the invention eliminates the insertion workability issues that arise with increased lamination counts. The groove structure accommodates the shoe part protrusion without requiring precise pin insertion through multiple laminated sheets
Solution Approach 2:
The groove in the magnetic pole tooth automatically guides and positions the shoe part protrusion during assembly. This self-guiding mechanism eliminates the need for precise manual or mechanical pin insertion, allowing the structure to self-align and assemble even with increased numbers of laminated sheets
3Adaptability or versatility
If a pin with small diameter is used to match the small shoe part size, then the shoe part rotation is enabled, but the pin is prone to break or bend
Solution Approach 1:
The invention removes the pin component entirely, replacing it with a groove-based mechanism. This eliminates the strength limitations of small-diameter pins while preserving the shoe part rotation capability through the groove-protrusion coupling system
Solution Approach 2:
The groove in the magnetic pole tooth has a curved cross-section that receives the shoe part protrusion. This curved geometry provides smooth guidance and support for the shoe part during rotation, enabling the rotational motion without requiring a fragile small-diameter pin
Data Source
AI summary
Provided is an armature core of a rotary electric machine according to the present invention including a shoe provided as a separate part with respect to each magnetic pole tooth. An arc-shaped cutout is formed in a distal end of the magnetic pole tooth, and the shoe part includes a circular portion. Through fitting between the arc-shaped cutout and the circular portion, the magnetic pole tooth and the shoe part are coupled together. The shoe part is configured to be rotatable with respect to the magnetic pole tooth with a circumference of the circular portion serving as a guide.